brazen faced
/ˈbreɪzən ˌfeɪst/
adjective
- Having or showing a complete lack of shame; extremely bold and impudent.
- His brazen-faced behavior at the formal dinner embarrassed everyone at the table.
- The brazen-faced liar claimed he had never even seen the missing money.
- She gave a brazen-faced smile after being caught cheating on the test.